A lot of things actually. Most common things we use were iriginally created for space travel. I don't know a ton of things, but here are a couple:
You know the capri sun pouches? That material was actually created by NASA for use in space.
Teflon is also used by NASA for space suits because the dust on the moon is really fine, and stuck to their suits a lot, so they needed something really smooth to help with that.
